55 lines
1.5 KiB
LLVM
55 lines
1.5 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; a, b;
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; fn1() {
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; if (b)
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; if (a == 0 || a == 5)
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; return a;
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; return 0;
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; }
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; Checking that we handle correctly the case when we have a switch
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; branching multiple times to the same block
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@b = common global i32 0, align 4
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@a = common global i32 0, align 4
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; Function Attrs: nounwind
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define i32 @fn1() {
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; CHECK-LABEL: @fn1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @b, align 4
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0
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; CHECK-NEXT: br i1 [[TOBOOL]], label %return, label %if.then
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; CHECK: if.then:
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; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* @a, align 4
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; CHECK-NEXT: [[SWITCH_SELECTCMP:%.*]] = icmp eq i32 [[TMP1]], 0
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; CHECK-NEXT: [[SWITCH_SELECT:%.*]] = select i1 [[SWITCH_SELECTCMP:%.*]], i32 0, i32 0
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; CHECK-NEXT: [[SWITCH_SELECTCMP1:%.*]] = icmp eq i32 [[TMP1]], 5
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; CHECK-NEXT: [[SWITCH_SELECT2:%.*]] = select i1 [[SWITCH_SELECTCMP1]], i32 5, i32 [[SWITCH_SELECT]]
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; CHECK-NEXT: br label %return
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; CHECK: return:
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; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ [[SWITCH_SELECT2]], %if.then ], [ 0, %entry ]
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; CHECK-NEXT: ret i32 [[RETVAL_0]]
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;
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entry:
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%0 = load i32, i32* @b, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %if.end3, label %if.then
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if.then:
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%1 = load i32, i32* @a, align 4
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switch i32 %1, label %if.end3 [
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i32 5, label %return
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i32 0, label %return
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]
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if.end3:
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br label %return
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return:
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%retval.0 = phi i32 [ 0, %if.end3 ], [ %1, %if.then ], [ %1, %if.then ]
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ret i32 %retval.0
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}
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